grep -P "^19" a_j.peaks > a_j.peaks.19
grep -P "^19" akr.peaks > akr.peaks.19
grep -P "^19" c3he_j.peaks > c3he_j.peaks.19
grep -P "^19" c57bl6_j.peaks > c57bl6_j.peaks.19
grep -P "^19" dba2_j.peaks > dba2_j.peaks.19
grep -P "^19" cba_j.peaks > cba_j.peaks.19
